On Wed, Nov 30, 2011 at 11:06:13PM +0100, Robert Jarzmik wrote: > Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> writes: > > > We use high vectors at 0xfff00000, so there won't be vectors at 0x0. the > > 0x0 mapping is only used to catch NULL pointer derefs. > > > That said, being able to catch NULL pointers is a very good thing, > > especially when there is flash at 0x0 which might be accidently > > overwritten by some code acting on NULL pointers. > I don't know if it can be that easily overwritten, but catching NPE is always > good, it's true. > > > With MMU we could just remap the flash in board code and pass the > > remapped address as resource to the cfi driver. While I think the > > cleanest solution would be to use ioremap in all drivers (and make > > this a no-op on most boards) I don't think it's worth it at the moment. > OK, remap in board, and input virtual mapping address into io ressource, simple > enough. OK, I'll try that. > That would require a function in arch/arm/cpu/mmu.c, to remap a physical address > range into a virtual one, wouldn't it ? Would you have a suggestion for the API > ? As in map_io_section(u32 phys_addr, void *virt) ? How about adding a size parameter ;) Yes, this looks good enough for now. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
